Porcelain Cast Iron Replacement Cooking Grid for Ducane 3073101, Affinity 3100, 31421001, Affinity 3300, Affinity 3400, Grill Chef and Uniflame Gas Grill Models, Set of 2 Fits Ducane Models: 3100, 3200, 3073101, Affinity 3100, 31421001, Afinity 3200, Affinity 3300, Affinity 3400, Affinity 4100, 4100, Affinity 4200, Affinity 4400 Fits Grill Chef Models: GC7550 Fits Uniflame Models: GBC850W, GBC850W-C, GBC850WNG-C, NSG3902B, NSG3902D Compatible Part Numbers: 55-08-167, 5508167, 30501009, 68502 Dimensions : 18"x 14-3/8" Each x 18"x 28-3/4" Total Material : Porcelian Cast Iron